Manganese dioxide (MnO2) is the common catalyst used in the decomposition of hydrogen peroxide, not manganese(V) oxide (Mn2O5).

Here are some substances that can act as catalysts in this reaction:

* Other metal oxides:

* Iron(III) oxide (Fe2O3)

* Copper(II) oxide (CuO)

* Cobalt(II) oxide (CoO)

* Metals:

* Platinum (Pt)

* Gold (Au)

* Silver (Ag)

* Enzymes:

* Catalase (found in living organisms)

Important Note: The effectiveness of each catalyst varies. Manganese dioxide is the most commonly used and effective catalyst for this reaction.

Mechanism of Decomposition:

The decomposition of hydrogen peroxide (H2O2) is a redox reaction where the catalyst facilitates the transfer of electrons. The catalyst provides a surface where hydrogen peroxide molecules can adsorb and interact. The catalyst itself undergoes oxidation and reduction cycles, ultimately accelerating the breakdown of hydrogen peroxide into water and oxygen.

Equation:

2 H2O2 → 2 H2O + O2